Fortran benchmark gamess from SPEC CPU2006 fails to build with current mainline
on powerpc-linux with "-O2 -ftree-loop-linear" due to the following ICE:

elm3b149% /home/janis/tools/gcc-trunk-anonsvn/bin/gfortran -c -O2
-ftree-loop-linear bug.f
bug.f: In function ‘foo’:
bug.f:1: internal compiler error: in initialize_matrix_A, at
tree-data-ref.c:1899
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

The following minimized testcase demonstrates the same problem:

      subroutine foo (n,x,y)
      implicit none
      double precision y(23821)
      double precision x(0:2*n)
      integer len,i,j,k,n
      len=0
      do i=0,n
        do j=0,i
          do k=j,i
            len=len+1
            y(len)=x(i-j)/(x(k+j)*x(i-k))
          enddo
        enddo
      enddo
      return
      end

The failure starts with this patch:

   http://gcc.gnu.org/viewcvs?view=rev&rev=135116

    r135116 | spop | 2008-05-09 16:17:47 +0000 (Fri, 09 May 2008)


-- 
           Summary: ICE in initialize_matrix_A with gamess for -ftree-loop-
                    linear
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: janis at gcc dot gnu dot org
GCC target triplet: powerpc-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37007